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導讀數據庫，簡而言之可視為電子化的文件柜——存儲電子文件的處所，用戶可以對文件中的數據進行新增、截取、更新、刪除等操作。所謂“數據庫”是以一定方式儲存在一起、能與多個用戶共享、具有盡可能小的冗余度、與應... 數據庫，簡而言之可視為電子化的文件柜——存儲電子文件的處所，用戶可以對文件中的數據進行新增、截取、更新、刪除等操作。所謂“數據庫”是以一定方式儲存在一起、能與多個用戶共享、具有盡可能小的冗余度、與應用程序彼此獨立的數據集合。 --產品數據重復統計 SELECT mc, userid, COUNT(mc) AS Expr1 FROM chanpin GROUP BY mc, userid --將不重復的紀錄插入新表newchanpin select * into #Tmp1 from chanpin go select min(ID) as autoID into #Tmp2 from #Tmp1 group by mc, userid go select * into newchanpin from #Tmp1 where ID in(select autoID from #tmp2) --查找重復用戶 --select distinct name from user_name select * into #Tmp0 from user_name go select min(ID) as autoID into #Tmp6 from #Tmp0 group by admin go select * into newuser_name from #Tmp0 where ID in(select autoID from #tmp6) --用戶自定義類別 SELECT userlb AS Expr1, userid AS Expr2, COUNT(userlb) AS Expr3 FROM newuser_lb GROUP BY userlb, userid select * into #Tmp8 from user_lb go select min(ID) as autoID into #Tmp9 from #Tmp8 group by userlb, userid go select * into newuser_lb from #Tmp8 where ID in(select autoID from #tmp9) --用戶新聞 select bt, userid,count(bt) from user_news group by bt,userid select * into #Tmp88 from user_news go select min(ID) as autoID into #Tmp99 from #Tmp88 group by bt,userid go select * into newuser_news from #Tmp88 where ID in(select autoID from #tmp99) 全新的路由器不僅讓你更穩定快速地連接無線網絡，更可以讓家中的智能設備連接在一起。 |
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